All static files that you want to serve should be in the root directory of your repository. No need to use a seperate www folder. buildpack-nginx will automatically download the buildpack, download NGINX, compile it, and install it. The next time you push your project, the buildpack will reuse the precompiled binaries.

Credits and License

buildpack-nginx is licensed under the CC0 1.0 Universal license and has been informed by many similar projects on the web